I read the article at the link you provided and found it interesting but it brings up another question to me. The article mention kava kava. I haven't seen that on the market in a long time. Do you know if it was removed and if so, what was the reason?
Doesn't look like it was removed from the market.
http://www.google.com/search?q=%22kava+kava%22
Kava is still available at health food stores and such. However, there has been some concern that it may cause liver damage in a very small percentage of regular users. It may have something to do with concommitant alcohol use and/or viral infections, or it may have to do with the extraction/preparation method of some manufacturers. It should definitely not be taken by those with liver disease.